Ahh. Takes me back. I used to teach 360/370 Fundamentals, and Assembly Language. The green card was famous. Thanks for the trip down memory lane.

We called the green card the "fig leaf" because you were basically naked without it!

Somewhere in my old IBM junk I should still have one of these cards
I always had one in my toolkit.

i have dozens of brand new 360 Green & 370 Yellow cards. thew were two versions of the green cards. I used to teach IBM mainframe Operating systems concepts at NYU in NY. also was a systems programmer for the nations largest bank

If you program in CICS Macro Assembler there were registers reserved for CICS.  It was challenging to write fast system tools for CICS in Assembler.  What I did was to keep the entire code inside a single page because you would lose some space for storing the register data into the memory.  The less data you needed to write to memory and keep in the register the faster the program ran.   In the 1980s speed was important when the Payroll programs were hogging all the resources.

Used to work in IBM S/360-S/370 world during 1970s & early 1980s - have been looking for the infamous "Green Card" for years, but can't find one anywhere; also the IBM user manual for assembly language control of the machine; also the MACRO assembler manual - any ideas where I could find these historic artifacts ?

we dont interested in history only tell about machine and nice video

Recycle